调用：
var
s:string;
begin
s:=SHA1encode('abc');
ShowMessage(s);
end;
{**************************************************** A binary compatible SHA1 implementation ** written by Dave Barton (davebarton@bigfoot.com) ***************************************************** 160bit hash size ****************************************************}unit sha1;interfaceuses Sysutils,windows,Classes;type TSHA1Digest= array[0..19] of byte; TSHA1Context= record Hash: array[0..4] of DWord; Hi, Lo: integer; Buffer: array[0..63] of byte; Index: integer; end;procedure SHA1Init(var Context: TSHA1Context);procedure SHA1Update(var Context: TSHA1Context; Buffer: pointer; Len: integer);procedure SHA1Final(var Context: TSHA1Context; var Digest: TSHA1Digest);function SHA1encode(const s:AnsiString):AnsiString;//******************************************************************************implementation{$R-}function SHA1encode(const s:AnsiString):AnsiString;var Context: TSHA1Context; Digest: TSHA1Digest; outs:array [0..40] of char ;begin SHA1Init(Context); SHA1Update(Context,@s[1],length(s)); SHA1Final(Context,Digest); BinToHex(pchar(@Digest),pchar(@outs[0]),Sizeof(Digest)); outs[40]:=#0; result:=AnsiString(outs);end;//******************************************************************************function F1(x, y, z: DWord): DWord;begin Result:= z xor (x and (y xor z));end;function F2(x, y, z: DWord): DWord;begin Result:= x xor y xor z;end;function F3(x, y, z: DWord): DWord;begin Result:= (x and y) or (z and (x or y));end;//******************************************************************************function RB(A: DWord): DWord;begin Result:= (A shr 24) or ((A shr 8) and $FF00) or ((A shl 8) and $FF0000) or (A shl 24);end;function LRot32(X: dword; c: integer): dword; register; assembler;asm mov ecx, edx rol eax, clend;procedure SHA1Compress(var Data: TSHA1Context);var A, B, C, D, E, T: DWord; W: array[0..79] of DWord; i: integer;begin Move(Data.Buffer,W,Sizeof(Data.Buffer)); for i:= 0 to 15 do W[i]:= RB(W[i]); for i:= 16 to 79 do W[i]:= LRot32(W[i-3] xor W[i-8] xor W[i-14] xor W[i-16],1); A:= Data.Hash[0]; B:= Data.Hash[1]; C:= Data.Hash[2]; D:= Data.Hash[3]; E:= Data.Hash[4]; for i:= 0 to 19 do begin T:= LRot32(A,5) + F1(B,C,D) + E + W[i] + $5A827999; E:= D; D:= C; C:= LRot32(B,30); B:= A; A:= T; end; for i:= 20 to 39 do begin T:= LRot32(A,5) + F2(B,C,D) + E + W[i] + $6ED9EBA1; E:= D; D:= C; C:= LRot32(B,30); B:= A; A:= T; end; for i:= 40 to 59 do begin T:= LRot32(A,5) + F3(B,C,D) + E + W[i] + $8F1BBCDC; E:= D; D:= C; C:= LRot32(B,30); B:= A; A:= T; end; for i:= 60 to 79 do begin T:= LRot32(A,5) + F2(B,C,D) + E + W[i] + $CA62C1D6; E:= D; D:= C; C:= LRot32(B,30); B:= A; A:= T; end; Data.Hash[0]:= Data.Hash[0] + A; Data.Hash[1]:= Data.Hash[1] + B; Data.Hash[2]:= Data.Hash[2] + C; Data.Hash[3]:= Data.Hash[3] + D; Data.Hash[4]:= Data.Hash[4] + E; FillChar(W,Sizeof(W),0); FillChar(Data.Buffer,Sizeof(Data.Buffer),0);end;//******************************************************************************procedure SHA1Init(var Context: TSHA1Context);begin Context.Hi:= 0; Context.Lo:= 0; Context.Index:= 0; FillChar(Context.Buffer,Sizeof(Context.Buffer),0); Context.Hash[0]:= $67452301; Context.Hash[1]:= $EFCDAB89; Context.Hash[2]:= $98BADCFE; Context.Hash[3]:= $10325476; Context.Hash[4]:= $C3D2E1F0;end;//******************************************************************************procedure SHA1UpdateLen(var Context: TSHA1Context; Len: integer);var i, k: integer;begin for k:= 0 to 7 do begin i:= Context.Lo; Inc(Context.Lo,Len); if Context.Lo< i then Inc(Context.Hi); end;end;//******************************************************************************procedure SHA1Update(var Context: TSHA1Context; Buffer: pointer; Len: integer);type PByte= ^Byte;begin SHA1UpdateLen(Context,Len); while Len> 0 do begin Context.Buffer[Context.Index]:= PByte(Buffer)^; Inc(PByte(Buffer)); Inc(Context.Index); Dec(Len); if Context.Index= 64 then begin Context.Index:= 0; SHA1Compress(Context); end; end;end;//******************************************************************************procedure SHA1Final(var Context: TSHA1Context; var Digest: TSHA1Digest);type PDWord= ^DWord;begin Context.Buffer[Context.Index]:= $80; if Context.Index>= 56 then SHA1Compress(Context); PDWord(@Context.Buffer[56])^:= RB(Context.Hi); PDWord(@Context.Buffer[60])^:= RB(Context.Lo); SHA1Compress(Context); Context.Hash[0]:= RB(Context.Hash[0]); Context.Hash[1]:= RB(Context.Hash[1]); Context.Hash[2]:= RB(Context.Hash[2]); Context.Hash[3]:= RB(Context.Hash[3]); Context.Hash[4]:= RB(Context.Hash[4]); Move(Context.Hash,Digest,Sizeof(Digest)); FillChar(Context,Sizeof(Context),0);end;end.